JP6793419B2 - 防錆部材およびその製造方法 - Google Patents
防錆部材およびその製造方法 Download PDFInfo
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- C23C22/82—After-treatment
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- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
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- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
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- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
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- C25D3/00—Electroplating: Baths therefor
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- C25D3/22—Electroplating: Baths therefor from solutions of zinc
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- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/565—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of zinc
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- Other Surface Treatments For Metallic Materials (AREA)
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Description
(2)前記化成皮膜は、前記Siリッチ領域と前記亜鉛系めっき層との間に、Znの含有量が前記亜鉛系めっき層に近づくほど増大する傾斜領域を有する、上記(1)に記載の防錆部材。
(3)前記傾斜領域の厚さは50nm以上である、上記(2)に記載の防錆部材。
(4)前記Siリッチ領域と前記傾斜領域とは厚さ方向に連続している、上記(2)または(3)に記載の防錆部材。
(5)前記化成皮膜は、Cr,P,B,C,S,O,Li,Ca,Mg,Mo,V,Nb,Ta,W,Zr,Fe,Ni,Co,Cu,Si,Ti,Zn,Al,SnおよびBiならびにランタノイドからなる群から選ばれる1種または2種以上の元素をさらに含有する、上記(1)から(4)のいずれかに記載の防錆部材。
(6)前記化成皮膜は反応型の化成皮膜である、上記(1)から(5)のいずれかに記載の防錆部材。
(7)前記化成皮膜は、酸化ケイ素を含有する、上記(1)から(6)のいずれかに記載の防錆部材。
(8)前記化成皮膜は、有機バインダ成分を実質的に含有しない、上記(1)から(7)のいずれかに記載の防錆部材。
(9)上記(7)に記載される防錆部材の製造方法であって、前記基材に前記亜鉛系めっき層を形成して、前記基材と前記亜鉛系めっき層とを備える被処理部材を得るめっき工程と、前記被処理部材を化成処理液に接触させ、その後、前記被処理部材を洗浄することを含んで、前記被処理部材に前記化成皮膜を形成する化成処理工程と、を備え、前記化成処理液は、化成反応を行う元素を含有する化成元素含有物質および酸化ケイ素を含有することを特徴とする防錆部材の製造方法。
[Si]≧[Zn] (1)
本明細書において、[Si]は化成皮膜におけるSi含有量(単位:原子%)であり、[Zn]は化成皮膜におけるZn含有量(単位:原子%)である。
[Si]/[Zn]≧1 (2−1)
[Zn]≦0.8×[Zn]0 (2−2)
下記の条件で防錆部材を作製した。
基材:鋼板
亜鉛系めっき層:電気亜鉛めっき
化成処理液:Cr(三価クロム)を化成元素とし、コロイダルシリカを含有
化成処理:化成処理液に40秒間浸漬、水洗、乾燥
実施例1と同様であるが、化成処理液への浸漬時間を40秒間から20秒間に変更して防錆部材を得た。この防錆部材についても深さプロファイルを測定し、Si/Zn比を算出した。これらの結果を図3および図2に示した。図3および図2に示されるように、Siリッチ領域の厚さは130nm程度であり、化成皮膜の厚さは200nm程度であった。したがって、実施例2では、Siリッチ領域に連続して位置する傾斜領域の厚さは70nm程度であった。
実施例1と同様であるが、化成処理液への浸漬時間を40秒間から60秒間に変更して防錆部材を得た。この防錆部材についても深さプロファイルを測定し、Si/Zn比を算出した。これらの結果を図4および図2に示した。図4および図2に示されるように、Siリッチ領域の厚さは300nm程度であり、化成皮膜の厚さは400nm程度であった。したがって、Siリッチ領域に連続して位置する傾斜領域の厚さは100nm程度であった。
実施例1と同様であるが、特許文献1の実施例1に示される化成処理を行って防錆部材を得た。この防錆部材についても深さプロファイルを測定し、Si/Zn比を算出した。これらの結果を図5および図2に示した。比較例に係る防錆部材の化成皮膜では、Si/Zn比が1以上であるSiリッチ領域は存在せず、化成皮膜の厚さは60nm程度であった。比較例に係る化成皮膜の表面観察を行ったところ、図7に示されるように、実施例1に係る化成皮膜の表面(図6)とは表面形態が大きく異なっていた。また、実施例1と同様に中性塩水噴霧試験を行った。その結果を表1に示した。
実施例1と同様であるが、亜鉛系めっき層を、電気亜鉛めっきに代えて、電気Zn−Ni合金めっきにより形成することにより、防錆部材を得た。形成した亜鉛系めっき層の組成を、蛍光X線膜厚計を用いて確認したところ、Znが82原子%であり、Niが18原子%であった。したがって、前述の式(2−2)より、実施例4に係る防錆部材が備える化成皮膜の傾斜領域では、亜鉛含有量が65.6原子%以下となる。
下記の条件により、反応型の化成皮膜を有する防錆部材を作製した。
基材:鋼板
亜鉛系めっき層:表2に示されるとおり
Zn:実施例1と同様の電気亜鉛めっき
Zn−Ni:実施例4と同様の電気Zn−Ni合金めっき
化成処理液:表2に示される元素を化成元素とし、コロイダルシリカを含有
化成処理:化成処理液に40秒間浸漬、水洗、乾燥
Claims (4)
- 基材と、前記基材に設けられた亜鉛系めっき層と、前記亜鉛系めっき層に設けられSiを含有する三価クロム化成皮膜とを備える防錆部材であって、
前記三価クロム化成皮膜は、
反応型の化成皮膜であり、
酸化ケイ素を含有し、
Si含有量のZn含有量に対する原子比が1以上であるSiリッチ領域を表層側に100nm以上の厚さで有し、
前記Siリッチ領域と前記亜鉛系めっき層との間に、Znの含有量が前記亜鉛系めっき層に近づくほど増大する傾斜領域を50nm以上の厚さで有し、
前記Siリッチ領域と前記傾斜領域とは厚さ方向に連続すること
を特徴とする防錆部材。 - 前記三価クロム化成皮膜は、P,B,C,S,O,Li,Ca,Mg,Mo,V,Nb,Ta,W,Zr,Fe,Ni,Co,Cu,Si,Ti,Zn,Al,SnおよびBiならびにランタノイドからなる群から選ばれる1種または2種以上の元素をさらに含有する、請求項1に記載の防錆部材。
- 前記化成皮膜は、有機バインダ成分を実質的に含有しない、請求項1または請求項2に記載の防錆部材。
- 請求項1に記載される防錆部材の製造方法であって、
前記基材に前記亜鉛系めっき層を形成して、前記基材と前記亜鉛系めっき層とを備える被処理部材を得るめっき工程と、
前記被処理部材を化成処理液に接触させ、その後、前記被処理部材を洗浄することを含んで、前記被処理部材に前記化成皮膜を形成する化成処理工程と、を備え、
前記化成処理液は、化成反応を行う元素を含有する化成元素含有物質および酸化ケイ素を含有することを特徴とする防錆部材の製造方法。
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JPS54102924A (en) | 1978-01-31 | 1979-08-13 | Sharp Corp | Driving circuit of thin-film el element |
JPH11335864A (ja) * | 1998-05-20 | 1999-12-07 | Nkk Corp | 耐食性に優れた表面処理鋼板の製造方法 |
JP3620510B2 (ja) | 2002-04-05 | 2005-02-16 | ユケン工業株式会社 | 基材とその製造方法と自動車部品 |
US20060166013A1 (en) * | 2005-01-24 | 2006-07-27 | Hoden Seimitsu Kako Kenyusho Co., Ltd. | Chromium-free rust inhibitive treatment method for metal products having zinc surface and metal products treated thereby |
JP2007162040A (ja) * | 2005-12-09 | 2007-06-28 | Chuo Spring Co Ltd | 高耐食性部材の耐食性評価方法、高耐食性部材、およびその製造方法 |
JP4189884B2 (ja) * | 2006-11-28 | 2008-12-03 | ユケン工業株式会社 | クロムフリー化成処理液および処理方法 |
JP5090101B2 (ja) | 2007-08-10 | 2012-12-05 | 株式会社大和化成研究所 | 亜鉛又は亜鉛合金めっき皮膜用の化成処理液及びそれを用いた防食皮膜の形成方法 |
JP5370997B2 (ja) * | 2008-03-27 | 2013-12-18 | ユケン工業株式会社 | 耐食性積層膜を有する部材、その部材の製造方法、ならびにその部材を製造するための処理液および塗料組成物 |
JP2013249528A (ja) | 2012-06-04 | 2013-12-12 | Dipsol Chemicals Co Ltd | アルミ変性コロイダルシリカを含有した3価クロム化成処理液 |
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- 2018-06-26 US US16/626,868 patent/US11851767B2/en active Active
- 2018-06-26 EP EP18825062.5A patent/EP3647463A4/en active Pending
- 2018-06-26 WO PCT/JP2018/024107 patent/WO2019004163A1/ja unknown
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WO2019004163A1 (ja) | 2019-01-03 |
EP3647463A4 (en) | 2021-05-05 |
EP3647463A1 (en) | 2020-05-06 |
CN110799670A (zh) | 2020-02-14 |
JPWO2019004163A1 (ja) | 2020-05-21 |
US20200115803A1 (en) | 2020-04-16 |
US11851767B2 (en) | 2023-12-26 |
MX2019015766A (es) | 2021-05-18 |
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